Saw a new chain on Ebay that fellow did not put in his Son's car. The chain snapped at 280K so he stripped all the new parts he had put on the car that were only a year old and the chain was NEVER PUT ON so it was still in the box. He wasn't as lucky, but perhaps car was not taken car of prior to him getting car or his Son hot rodded it if u can hot rod a diesel. I guess you could do that. I usually keep mine below 3.5k on the tach but this is shifted down on gear on grades.

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1982 300SD